Preparation

For pork belly:
Rub coarse salt and coriander into pork belly. Cover and chill at least 4 hours and up to 2 days.

Preheat oven to 275°F. Place pork belly in large ovenproof saucepan. Add onion, next 5 ingredients, 2 tablespoons wine, and chicken broth. Bring to boil, cover, and transfer to oven. Cook until pork is very tender when pierced with fork, turning every 30 minutes, about 2 hours 15 minutes. Cool slightly. Cover and chill at least 1 day and up to 2 days.

Discard any solidified fat on surface of pork belly mixture. Remove pork from cooking liquid, scraping any gelatinous mixture back into saucepan. Rewarm mixture in saucepan just until melted. Strain liquid into measuring cup. Add white wine if necessary to measure 1/2 cup. Cut rind and all but 1/4-inch layer of fat from pork belly. Slice pork crosswise into 1/2-inch slices, then cut slices crosswise into 1/2-inch-thick strips.